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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052eeacf85bf6a03c45cfe47fda36e7c021690a1e9c4816c5ee87155d782b039' 
  AND token = 't7F8hU/C1al3i/It1W6XTNDCDMzDBvWYvubWH42qlm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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