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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc554d4c6c41e9a4227cc776ce1e8bd17c0a22910422e2423b7536f3b3262499' 
  AND token = 'zUVCpmDCLYKUFbg+bCTMbuTlzyvPehDL174czgaiARw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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