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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b285fc909bc20d76b6798d91fe7f78774ce565696439dbc965a4ee0a99e74b70' 
  AND token = 'epeHftsKWxZ67snIAuC6BVnlByhgLh8LLETidhLFl4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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