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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d23afd88088c1b2305ceeadb12d77afdf03602f62653cd83d08fab4434296c3' 
  AND token = 'VDfc6DmnziRN5SHMlYLN83AWa49JehYe4K71g5QboUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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