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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b134cfe80ef1573ffb28019b052e3cafe8cb8ee70a9141718fe5315a0244160' 
  AND token = 'pvaL384V+/A5jSW0ppy38SM1yBCF12NCIBwlzz6PeG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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