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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a9dafb0dcb3e60f9c7d5a576e14674597c6baf216f6d93cbc776683da93fce' 
  AND token = '3yA+hii+5M5rcf3QoJzFWfR0l6FKm+y3mKZBRrR+JO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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