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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4cc2c16f4c3339fcd640f12089fe4c64a901c821de265e134716dfe555b49a' 
  AND token = 'xJKY8HsvLsoyj4NXmknuA8HVMRTqa9Z9fXUW3/yNVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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