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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e3ed77d36b9ef68ede7a8f0162fa10211e821688f4db4f714a5218c40fcd64' 
  AND token = 'eFR/9VObi8a3NZnx2O6AuB8RRuF221b278l++YFz+Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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