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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c90202d29a98541991a797c866e44d819af5404a70c723a3e000c1052b6773' 
  AND token = 'Fk3Uyrw3iBCN/75Y5IqBR4ZzwYSinRudurhjcYTDGQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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