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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a988cbcf8fb5acc3c3e4b62611d886821e214281154a086048d50eb17af01071' 
  AND token = 'LlQz4trm6gKP+xNMsFkZ1M85esRhYRyn/HOTmgGML1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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