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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bfdeca093a450dcd90ac0a9a3ceb67bb4b1082693de33d3bfa7e288309ae09' 
  AND token = 'LhzXW3shf4JLYE15JaUCOKCqKCokMtfz2hGvHT8wof8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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