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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90116d1176ea36ce50df10532fd3a20cc0341036a25fb38fe53bed11829e5fd' 
  AND token = 'tRJZO5OkmDLUtVYj+tu8Pja1hafY0NZt7E/E52SvA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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