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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2a8c8702b1104d5e03538f4af31f13370e81ab4b8c4dbd7dc932668c0bf9b1' 
  AND token = 'r36rnJaG2b84YFg3YPgcpEilIVqVQLVuF1vPurApEr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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