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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba40302d68212d19a3505337577be5f3ad01ffd77b0600e63d2e64e4da8e9df0' 
  AND token = 'q7k7ymkKsA8uD6fjU3trj7gAkOLeZ7h+zmYrvJmyXF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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