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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c7c6b58e66ee5986f0624885d5f6872257cbf3c28d178a87876938b2f7b6ad' 
  AND token = '3pjWgyO4yKCT5Evr4o/1eF5FENRHkN4CRIJjHwkBwyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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