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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5af7c1eadff09cdec06a1bb58e08dea962393523d6a61ac36bf69c2b236858' 
  AND token = 'BXm2SgAIW9RNX2wPU4ukFZU1V18lNzs9eapb5NwKW4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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