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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332877405ba40ef29a5f2774593a6c3ef123b65bd59142ab4a0353f175de8681' 
  AND token = 'H5Vp37rri42f/KVnHyY6f0xUpvwUaSa+z7N3fqwqqmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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