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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab672047df1893eef2b83f244c6500f255cfc21ea9e07766a65687bf0032d1c' 
  AND token = 'zqVX1GfvPjFM0lykavdWPFHTDZWGPp5Rz33BuO8sPWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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