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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ecb412c515c88a99fb5124a637d659cd1bae2d4135e2c9c5176afcd2c151ad' 
  AND token = '8fdBBye4W+q7dheBUXK2VWXEaLVda8tR77FINnnodY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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