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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767ee63fa9a7284bbc4321dc9dae28062a4ef4b4211cdc8487017ae527e89404' 
  AND token = '+a8p1i9WhPsUXmewjGDo1gw/m/0XH1C2nieyogImeL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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