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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b48b0b8f8d1cdadb74fff4f2bb2bfad3c0d59ee9765a3d61dc3e46aa2e72f2' 
  AND token = '0uqIskp3wz6EfD/ahxwbA1AxEgn44b9RFgKCQfiaYv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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