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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700b2dd8ce8380536aa4e3fc253e20f34a887e97baa7f921b80bcb6267c43db3' 
  AND token = '8JbabBWpvoMiJaFDck6VgwgO+2vHkd8E1YKoTL2q8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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