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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5e8fb9c17f917b439fe0ceb03a672eb5621b4a6a8a63b790470f0782886b8a' 
  AND token = 'MtUv61EQ+CC27YAq8C/I5iN1t6/torwcnZkyduFkh4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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