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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61abc134460f3ad30a6cef728a6f8a88f6e2668562f331d6bb0f356f326b59d3' 
  AND token = 'l783JAeJToSag9piOJ/pLbN8L/hmbCW28eEd7CNs5a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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