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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1867cfb52c84b13427c78a73e09a3a4488b02efd8df03da170dc3440b6c667d' 
  AND token = 'U+4ZDU+74j5bNnyOmSxGf/mdK6cpK6/1FkSyxjbFpIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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