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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be822a28db8a1a8c282e1d5f751450f55909a4408b55c800302ef9d4e21b7d1' 
  AND token = 'VSVoU8UaZ5Ku4YDTWHlNtFmYUcMWBE+q9pFnVjLlJ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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