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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6496353de9ac44d3d2399c6fe66a5e0816d365dea7902145bd94e04098322b' 
  AND token = 'w+asFCsdPaWAMe4CY1P70Gn7xf64hVAExBU72M4J0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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