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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49306f5e57ed1fc96bfdc060b8f467a362c28f24035deb19c32ea5deacb42b1a' 
  AND token = '0sHbX7/ivVDP+nLtPGYvpzxedFMftb65r41ahu94jVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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