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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb35f2d24d653c3882533fc788eddb0141b8ecd55154c026778bb641de72d95' 
  AND token = 'jkpwwAJyo/gbDgY8OwiBk78kFEf/7f6mEj64XPlfzsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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