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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f869c1011dfbf95898ec28131d80d14e28de7ae4c5455742a0a6644d2ecb6' 
  AND token = '+9T4tXNI6OFWGjTko/OS2+icXa3kPjsmHBJnBwRlj9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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