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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb997ad15e1d74b337fd4deff6e314e99eb515a4bd4ad3f400e916c3f658aa7' 
  AND token = 'WPgEI1PufXoa/E9o470R3nFdsPhDJIfqErGekcGCcy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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