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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b92e1e7a860ebc5c66d0ba03f9dbccf4bfa537ae119a1746ee8ed47237b8d03' 
  AND token = 'c/irODahfBuCHS6nzUJQjscuUHJXn3aTfYuFAT72Ir4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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