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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c6b735709c1d23f86037fd85bea03eb811fa14d7e0990359b088742dd8e8df' 
  AND token = '4g6xM26JEdRh9TxgSHKkYN7ihOeUBbk3J+nSbPlPEpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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