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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be923e934e9f21bd5ebaf9928f6053c2ed61fb1f5b1ad0a502018ced231f71a5' 
  AND token = 'sN4bZTt37Ia/V2uMJuL5bHp3uRYx7ReugJnplwbj2BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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