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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcabf9f1b9024ca2c8718997dce2e01fe1f481d4552380d9d3f513b656ad4c5' 
  AND token = 'utsBuw/yRVAA64IJl7vkkxxjEBieNVLz6d/HOB25ADQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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