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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3460a63240048a29e95cee08abb44671033e3015d5d2bc284d3ee3525df63e0' 
  AND token = 'N66BohTtLyRU2XiHNixDlmDf2hWVqmPOduoGZSt2tC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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