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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de04ef2318dacfbe0e13f35aa76c6a3cd06acbf0f56659378421ff3cc8ff689' 
  AND token = '7clG6GH4YOaQ8MoLzP+sD8cOFEF1PU88C7LJ954kGGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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