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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d390af4acd76b2e94562cf03b989098cd8c8931033f9cb7eda3bdf82ba3d0e' 
  AND token = 'fCS7cBg2vP4clJT3qPsI0dR+jfkCrjSWnY/w3M6eLdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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