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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132c9bbee25bb2b6b3b8501a7593a8dbc124fcff100ed27c244f3087024649e9' 
  AND token = 'E0ub1zfJNM0IJHLcqoynuARj7FIICckI4MneaDp/ucc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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