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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d332080a8e67913d4e2f545fc32e4556f89a3e388f5bb621948d4a190bff0d0' 
  AND token = 'TawNb/4TK31cbrW1Kse1H4fo3ISnRecVN2VDhTgtei0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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