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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3087794763ea05400e18f94dc684fba5fe3c7ce2f399ee734bb2fcad2871dc9b' 
  AND token = 'OWe3pPXfwvnvQ/pHvy2qZMwt9Kyx19owBHoI453QwIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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