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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba83166d56850bce40d39edf821cbdcab1ffe374f4247388d2a4b7e8d1326b1' 
  AND token = 'ptzjYvptv1cLpsHN6t5zsUGgI1UHjNiX3EuJxopbgXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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