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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b996d1cdcc5e8c6c1465cffcbda706566be09b007185067c7d6a0fc9d714d6ae' 
  AND token = 'Bp86UIZsGA5UlNwFDJ9aBWILGYKNxTGEmXIUWnNqktk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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