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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a6f4eb937d89caaa1a42d5b0798fc7792e53fe9a96c1bad52600bb2a27ad22' 
  AND token = 'iU6fvnSWbyjphE8DJson5leH3hSo6fDHCrrbxzo+KLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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