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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc327b52eaad053e02357b42d97c6c5f5570742ab6c38ce603b44f2f307aecbf' 
  AND token = 'xTDJ8Ba1AqSI7zC7yiQXRq5d4+bdiwbIcN8fT/R3Tvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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