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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7c94a2e0b9b560a08ab238ea180a691dff6a4e29b53b9e410e2c29520def54' 
  AND token = 'P/YdqtgbjhmvBIdYiGyuIAWK040j2QpBaA67oZd9JT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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