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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b076e940a5d5e672209db03668e723b46317ae4cf98791a24d7f929d2a4b7417' 
  AND token = 'D+s7xEawFQWnyG4z9rDiSVDXc9/GpaZl8vUmGVbTTao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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