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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d69cf6f3836ee884e47e7e5451fd371a6fe618b6e37bd35d0eb9765993823c' 
  AND token = 'lhj9E7u1veGBG6ZzI1BVZ9Do2wUbeDEXmazEiZS41eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}