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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf448765d2c6fcc78f7cf9774ec7f27484c15089d9a3809af1b283fa3deeec68' 
  AND token = '1y/lyShwcRggjVkvST7oDgatKDmxNWZAy+4znAM065g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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