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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91c274f0a69900571eeb08c3611df142104c9fd07816fee277fa090b8719863' 
  AND token = 'oiQZnbcPc70i89ikrjxrkt5n4Fm2yi266WPx6myfO2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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