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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82340eb0b7f69ac902e52ee17147e923654b1b0afd274b050ee263a3eccc195a' 
  AND token = '0p9dPIhqO1LZ6Tlch6etS+wzSWQQRCH8FpRoxbvKRKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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