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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd6efed69ee90dd54b1411409a94d4f112af96eac1ca14493cf3c98cc67daf6' 
  AND token = 'g1Xvat8QU/YZbAFz68QoTjaYENgYFTv0suasfOSvjDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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