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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb27fe1c34293ec6944f3085d6e0c010c12f2ce215f64ddf7cded0e0d88375a' 
  AND token = '+3E3BGTjCvW3kj6LSW2E8evHBAomLMNqC2G5Mn2SKYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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