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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff321da2d44398654ba696ae3f13523091a3287141af03c91d4af10ca0deb323' 
  AND token = 'C5bgUBlxIv7lM5Wp7dD6Kgx2noeEv5oK9cqziXmy87g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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