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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c2f2c68a694f3ffade588ebaad82b1965f0c3f676f8ee282383e223aeed818' 
  AND token = 'BG1b9hWkTIPFAMAc0D6HutrP80nfyh7L1B2O+tFWIro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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