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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8e26d1ac695a606207a6b37d3199739c4bc4a19cf67ab760119c05b5a4bb53' 
  AND token = '8HQBiPTfhDbAFay2Gllw9ZcIrdfmkD2f8eHpWK7UHwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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